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    • CommentRowNumber1.
    • CommentAuthorUrs
    • CommentTimeNov 12th 2010
    • (edited Nov 12th 2010)

    There is a student here who is thinking about how to relate \infty-algebraic theories with \infty-operads and in the course of that also dendroidal sets with Lurie-type “\infty-categories of operations” of \infty-operads.

    I am trying to help a bit where I can. First of all I thought I’d need to get a better idea of how the triangle

    monads operads algebraictheories \array{ && monads \\ \\operads &&&& algebraic theories }

    works in 1-category theory. So I am naturally looking at Mike’s Generalized Virtuology to get some hints.

    I had planned to typeup the little that I understand about the relation between Lawvere theories and generalized multicategories, but now I ended up spending some time just on the entry on virtual double categories. Here is what I did

    • created a subsection “Monads on virtual double categories” with the basic definitions

      • and further subsections on “Monoids and modules” (this existed as an empty stub before)

      • and “Generalized multicategories” (with the basic definition, then pointing over to generalized multicategory of course).

    I also

    I took the liberty of mentioning the term “fc-multicategory” at the beginning of virtual double category (because that happens to remind me easier of what the term refers to) and at virtual equipment I said that this term is short for “proarrow equipment of a virtual double category”.

    (Hm, that summary of what i did is almost longer than the little bit of text that I acutally added! :-)

    Mike, here is a question:

    when I read your article with Cruttwell, I have slight trouble when it comes to definition 8.2 of normalized monoids. It has a horizontal morphism labeled U AU_A where definition 4.2 has an equality. It seems. Is there a typo in one of these or did I miss some further definition in the intermediate four sections (not unlikely)?

    • CommentRowNumber2.
    • CommentAuthorMike Shulman
    • CommentTimeNov 12th 2010

    Thank you! Geoff and I have been meaning to improve those pages for a while, but haven’t had time yet.

    Definition 8.2 only makes sense in a virtual equipment, or at least a virtual double category with units (defined in section 5). When you have units, there is a natural bijection (essentially by definition of “units”) between cells of nullary source starting at an object A, and cells of unary source whose source is a unit horizontal arrow U AU_A. Definition 4.2 uses the former, since at that point we are only in a virtual double category, while 8.2 refers (implicitly) to the equivalent cell of the latter form, since only a cell of unary source can be said to be cartesian. Does that clarify?

    • CommentRowNumber3.
    • CommentAuthorMike Shulman
    • CommentTimeFeb 6th 2014

    I added a reference to a recent paper of Hyland to generalized multicategory.

    • CommentRowNumber4.
    • CommentAuthormattecapu
    • CommentTimeJan 23rd 2023
    • (edited Jan 23rd 2023)

    Are Burroni’s T-categories the same thing as generalized multicategories? It seems to me they are. If yes I will add the reference to the page

    • CommentRowNumber5.
    • CommentAuthormaxsnew
    • CommentTimeJan 23rd 2023

    Oui. Looks like an oversight in the references here